-- to see disks and partitions

cat /proc/partitions

-- partition-util

parted /dev/hdd

--help

(parted) help

-- create partition with fs-type-reservation (without fs)

(parted) mkpart primary ext3 0 120000

-- double-check

(parted) print

-- label the new partition

e2label /dev/hdd1 /secretdisk

-- make filesystem on the new partition

/sbin/mkfs -t ext3 /dev/hdd1

-- create the new mountpoint

mkdir /secretdisk

-- create the new mapper

/usr/bin/cryptsetup -y create secretdisk /dev/hdd1

-> password for secretdisk

-- make the conversion

dd if=/dev/hdd1 of=/dev/mapper/secretdisk bs=4k

-- mount it

/bin/mount /dev/mapper/secretdisk /secretdisk

---> use it !!!